Sniffing longer rather than stronger to maintain olfactory detection threshold.

Sniffing longer rather than stronger to maintain olfactory detection threshold.
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为了维持嗅觉检测阈值,嗅的时间更长而不是更强。

DOI:
10.1093/chemse/25.1.1
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发表时间:
2000
期刊:
影响因子:
3.5
通讯作者:
Gabrieli,JD
Gabrieli,JD
中科院分区:
心理学4区
文献类型:
--
作者:
Sobel,N;Khan,RM;Hartley,CA;Sullivan,EV;Gabrieli,JD

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通常一个鼻孔的气流流速比另一个鼻孔高。此外,在一定范围内,较高的鼻流量可以改善气味检测。由此可见,相对于流量较小的鼻孔,流量较大的鼻孔对气味的检测效果更好。矛盾的是,先前的研究表明,高流量和低流量的鼻孔对气味的检测阈值是相等的。在这里,我们解决了这个明显的悖论,表明当通过低气流流速的鼻孔进行检测时,人们比通过高气流流速的鼻孔进行检测时嗅的时间更长,从而平衡了鼻孔之间的表现。当这种补偿机制被阻断时,在气味检测中,高空气流量的鼻孔比低空气流量的鼻孔有明显的优势。最后,我们表明,正常的出生嗅持续时间可能使只有一个鼻孔达到最佳阈值。这一发现表明,在每次嗅闻时,每个鼻孔向大脑传递的嗅觉世界图像略有不同。大脑如何将这些图像组合成一个单一的嗅觉感知还有待研究。
Air flow-rate is usually higher in one nostril in comparison to the other. Also, within bounds, higher nasal flow-rate improves odorant detection. It follows from the above that odorant detection should be better in the nostril with higher flow-rate in comparison to the nostril with lower flow-rate. Paradoxically, previous research has shown that odorant detection thresholds are equal for the high and low flow-rate nostrils. Here we resolve this apparent paradox by showing that when detecting through the nostril with lower air flow-rate, humans sniffed longer than when detecting through the nostril with higher air flow-rate, thus equalizing performance between the nostrils. When this compensatory mechanism was blocked, a pronounced advantage in odorant detection was seen for the nostril with higher air flow-rate over the nostril with lower air flow-rate. Finally, we show that normal birhinal sniff duration may enable only one nostril to reach optimal threshold. This finding implies that during each sniff, each nostril conveys to the brain a slightly different image of the olfactory world. It remains to be shown how the brain combines these images into a single olfactory percept.
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